linux-kernel - Re: [PATCH v3 4/4] io_uring: add support for zone-append

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Date:   Tue, 21 Jul 2020 01:47:20 +0530
From:   Kanchan Joshi <joshiiitr@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>,
        Kanchan Joshi <joshi.k@...sung.com>, viro@...iv.linux.org.uk,
        bcrl@...ck.org, Damien.LeMoal@....com, asml.silence@...il.com,
        linux-fsdevel@...r.kernel.org, "Matias Bj??rling" <mb@...htnvm.io>,
        linux-kernel@...r.kernel.org, linux-aio@...ck.org,
        io-uring@...r.kernel.org, linux-block@...r.kernel.org,
        Selvakumar S <selvakuma.s1@...sung.com>,
        Nitesh Shetty <nj.shetty@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>
Subject: Re: [PATCH v3 4/4] io_uring: add support for zone-append

On Mon, Jul 20, 2020 at 10:44 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Mon, Jul 20, 2020 at 10:19:57PM +0530, Kanchan Joshi wrote:
> > On Fri, Jul 10, 2020 at 7:41 PM Kanchan Joshi <joshiiitr@...il.com> wrote:
> > > If we are doing this for zone-append (and not general cases), "__s64
> > > res64" should work -.
> > > 64 bits = 1 (sign) + 23 (bytes-copied: cqe->res) + 40
> > > (written-location: chunk_sector bytes limit)
>
> No, don't do this.
>
>  struct io_uring_cqe {
>         __u64   user_data;      /* sqe->data submission passed back */
> -       __s32   res;            /* result code for this event */
> -       __u32   flags;
> +       union {
> +               struct {
> +                       __s32   res;    /* result code for this event */
> +                       __u32   flags;
> +               };
> +               __s64           res64;
> +       };
>  };
>
> Return the value in bytes in res64, or a negative errno.  Done.

I concur. Can do away with bytes-copied. It's either in its entirety
or not at all.